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The collision cross sections (CCS), momentum transfer cross sections (MTCS),or scattering cross sections (SCS) of an electron neutral pair are importantcomponents for computing the electric conductivity of a plasma gas. Largercollision cross sections for electrons moving freely within neutral particles(molecules or atoms) cause more scattering of these electrons by the neutralparticles, which leads to degraded electron mobility, and thus reduced electricconductivity of the plasma gas that consists of electrons, neutral particles,and ions. The present work aimed to identify the level of disagreement betweenfour different methods for describing how electron neutral collision crosssections vary when they are treated as a function of electron temperaturealone. These four methods are based on data or models previously reported inthe literature. The analysis covered six selected gaseous species that arerelevant to combustion plasma, which are as follows: carbon monoxide (CO),carbon dioxide (CO2), molecular hydrogen (H2), water vapor (H2O), potassiumvapor (K), and molecular oxygen (O2). The temperature dependence of thecollision cross sections for these species was investigated in the range from2000 K to 3000 K, which is suitable for both conventional air fuel combustionand elevated temperature oxygen fuel (oxy-fuel) combustion. The findings of thepresent study suggest that linear functions are enough to describe thevariations in the collision cross sections of the considered species in thetemperature range of interest for combustion plasma. Also, the values of thecoefficient of variation (defined as the sample standard deviation divided bythe mean) in the collision cross sections using the four methods wereapproximately 27% for CO, 42% for CO2, 13% for H2, 39% for H2O, 44% for K, and19% for O2.

Temperature Dependent Functions of the Electron Neutral Momentum Transfer Collision Cross Sections of Selected Combustion Plasma Species